Protein biosynthesis - Revision history

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	~~'''~~Protein biosynthesis''' is the process by which [[biological cells]] generate new [[proteins]]; it is balanced by the loss of cellular proteins via degradation or export. Understanding protein biosynthesis is crucial in the fields of [[molecular biology]], [[genetics]], and [[biochemistry]]. The process involves transcription, translation, and post-translational modifications.		== Protein Biosynthesis ==

	~~==Transcription==~~		'''Protein biosynthesis''' is the process by which cells build proteins, which are essential macromolecules that perform a vast array of functions within organisms. This process involves the [[transcription]] of [[DNA]] into [[RNA]] and the subsequent [[translation]] of RNA into a [[polypeptide]] chain that folds into a functional protein.
	~~Transcription~~ is the ~~first step in protein biosynthesis~~. ~~It occurs in~~ the [[~~cell nucleus~~]] ~~where~~ [[DNA]] ~~is used as a template to make~~ [[~~messenger~~ RNA ~~(mRNA)~~]]~~. This process is regulated by~~ [[~~transcription factors~~]] that ~~ensure the correct gene is copied~~.

	==~~Translation~~==		=== Overview ===
	~~Translation is the process by which the mRNA~~ is ~~decoded by the [[ribosome]] to produce~~ a ~~specific [[amino acid]] chain, or [[polypeptide]]~~, that ~~will later fold~~ into ~~an active [[protein]]~~. ~~Translation occurs in the~~ [[~~cytoplasm~~]], ~~where~~ [[~~transfer RNA (tRNA)~~]] ~~brings amino acids to the ribosome~~, ~~matching them to the coded mRNA message~~.		Protein biosynthesis is a complex, multi-step process that occurs in all living cells. It is divided into two main stages: transcription and translation. These stages are tightly regulated and involve numerous [[enzymes]], [[ribosomes]], and other molecular machinery.

	==~~Post-Translational Modifications~~==		=== Transcription ===
	~~After translation,~~ the ~~new~~ protein ~~can undergo several modifications~~, ~~known as post-translational modifications~~. ~~These can include~~ [[~~phosphorylation~~]], [[~~glycosylation~~]], and [[~~ubiquitination~~]]~~, which are critical for the function, location, and life span~~ of ~~the protein~~.		[[File:Transcription.svg\|thumb\|right\|Diagram of transcription process.]]
			Transcription is the first step in protein biosynthesis, where the genetic information in [[DNA]] is copied into [[messenger RNA]] (mRNA). This process occurs in the [[nucleus]] of [[eukaryotic cells]] and in the [[cytoplasm]] of [[prokaryotic cells]].

	==~~Regulation~~ of ~~Protein Biosynthesis~~==		==== Steps of Transcription ====
	The ~~regulation~~ of ~~protein biosynthesis is essential for cellular function and involves mechanisms that control~~ the ~~initiation of transcription and translation~~. ~~These mechanisms ensure proteins are produced at~~ the ~~right time~~, ~~in the right place~~, ~~and in~~ the ~~right amounts~~.		1. '''Initiation''': The enzyme [[RNA polymerase]] binds to a specific region of the DNA called the [[promoter]].
			2. '''Elongation''': RNA polymerase moves along the DNA template strand, synthesizing a complementary RNA strand.
			3. '''Termination''': Transcription continues until RNA polymerase reaches a termination signal, releasing the newly synthesized mRNA.

	==~~Clinical Significance~~==		=== Translation ===
	~~Disruptions in protein biosynthesis can lead to diseases, including~~ [[~~cancer~~]], [[~~neurodegenerative diseases~~]], ~~and [[infectious diseases]]. Understanding these processes is crucial for developing therapeutic strategies~~.		[[File:Translation.svg\|thumb\|left\|Diagram of translation process.]]
			Translation is the process by which the mRNA is decoded to build a polypeptide chain, which will fold into a functional protein. This process occurs in the [[ribosome]], a complex molecular machine found in the cytoplasm.

	[[~~Category:Biochemistry~~]]		==== Steps of Translation ====
	[[~~Category:Molecular biology~~]]		1. '''Initiation''': The small ribosomal subunit binds to the mRNA near the start codon (AUG), and the initiator [[tRNA]] carrying [[methionine]] binds to the start codon.
	~~[[Category~~:~~Genetics]]~~		2. '''Elongation''': The ribosome moves along the mRNA, and tRNAs bring amino acids to the ribosome, where they are added to the growing polypeptide chain.
			3. '''Termination''': When a stop codon is reached, the ribosome releases the completed polypeptide chain.

	~~{{Biochemistry~~-~~stub}}~~		=== Post-Translational Modifications ===
	~~{{Molecular~~-~~biology-stub}}~~		After translation, proteins often undergo further modifications, known as [[post-translational modifications]], which are critical for their function. These modifications can include [[phosphorylation]], [[glycosylation]], and [[cleavage]] of certain segments.
	~~{{Genetics~~-~~stub}}~~
	~~{{Medicine~~-~~stub}}~~		=== Regulation of Protein Biosynthesis ===
	~~<gallery>~~		Protein biosynthesis is tightly regulated at multiple levels, including transcriptional, post-transcriptional, translational, and post-translational levels. This regulation ensures that proteins are synthesized at the right time, place, and in the correct amounts.
	~~File:Summary_of_the_protein_biosynthesis_process~~.~~png\|Protein_biosynthesis~~
	~~File:Nucleotide_structure_within_a_polynucleotide_chain.png\|Protein_biosynthesis~~		== Related Pages ==
	~~File:Directionality_of_DNA_molecule.png\|Protein_biosynthesis~~		* [[Gene expression]]
	~~File:Process_of_DNA_transcription.png\|Protein_biosynthesis~~		* [[Ribosome]]
	~~File:Post-transcriptional_modification_of_pre-mRNA.png\|Protein_biosynthesis~~		* [[RNA]]
	~~File:Translation_-_cycle.png\|Protein_biosynthesis~~		* [[Amino acid]]
	~~File:Protein_translation.gif\|Protein_biosynthesis~~		* [[Enzyme]]
	~~File:Protein_folding_figure.png\|Protein_biosynthesis~~
	~~File:Post-translational_modification_by_cleavage.png\|Protein_biosynthesis~~		{{Protein biosynthesis}}
	~~File:Post-translational_modification_through_the_addition_of_small_chemical_groups.png\|Protein_biosynthesis~~
	~~File:Glycosylation_of_a_polypeptide.png\|Protein_biosynthesis~~		[[Category:Protein biosynthesis]]
	~~File~~:~~Formation_of_disulphide_covalent_bonds.png\|Protein_biosynthesis~~
	~~</gallery>~~

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2025-02-18T12:09:14Z

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← Older revision		Revision as of 12:09, 18 February 2025
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	{{Genetics-stub}}		{{Genetics-stub}}
	{{Medicine-stub}}		{{Medicine-stub}}
			<gallery>
			File:Summary_of_the_protein_biosynthesis_process.png\|Protein_biosynthesis
			File:Nucleotide_structure_within_a_polynucleotide_chain.png\|Protein_biosynthesis
			File:Directionality_of_DNA_molecule.png\|Protein_biosynthesis
			File:Process_of_DNA_transcription.png\|Protein_biosynthesis
			File:Post-transcriptional_modification_of_pre-mRNA.png\|Protein_biosynthesis
			File:Translation_-_cycle.png\|Protein_biosynthesis
			File:Protein_translation.gif\|Protein_biosynthesis
			File:Protein_folding_figure.png\|Protein_biosynthesis
			File:Post-translational_modification_by_cleavage.png\|Protein_biosynthesis
			File:Post-translational_modification_through_the_addition_of_small_chemical_groups.png\|Protein_biosynthesis
			File:Glycosylation_of_a_polypeptide.png\|Protein_biosynthesis
			File:Formation_of_disulphide_covalent_bonds.png\|Protein_biosynthesis
			</gallery>

Prab: CSV import

2024-03-22T12:50:04Z

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New page

'''Protein biosynthesis''' is the process by which [[biological cells]] generate new [[proteins]]; it is balanced by the loss of cellular proteins via degradation or export. Understanding protein biosynthesis is crucial in the fields of [[molecular biology]], [[genetics]], and [[biochemistry]]. The process involves transcription, translation, and post-translational modifications.

==Transcription==
Transcription is the first step in protein biosynthesis. It occurs in the [[cell nucleus]] where [[DNA]] is used as a template to make [[messenger RNA (mRNA)]]. This process is regulated by [[transcription factors]] that ensure the correct gene is copied.

==Translation==
Translation is the process by which the mRNA is decoded by the [[ribosome]] to produce a specific [[amino acid]] chain, or [[polypeptide]], that will later fold into an active [[protein]]. Translation occurs in the [[cytoplasm]], where [[transfer RNA (tRNA)]] brings amino acids to the ribosome, matching them to the coded mRNA message.

==Post-Translational Modifications==
After translation, the new protein can undergo several modifications, known as post-translational modifications. These can include [[phosphorylation]], [[glycosylation]], and [[ubiquitination]], which are critical for the function, location, and life span of the protein.

==Regulation of Protein Biosynthesis==
The regulation of protein biosynthesis is essential for cellular function and involves mechanisms that control the initiation of transcription and translation. These mechanisms ensure proteins are produced at the right time, in the right place, and in the right amounts.

==Clinical Significance==
Disruptions in protein biosynthesis can lead to diseases, including [[cancer]], [[neurodegenerative diseases]], and [[infectious diseases]]. Understanding these processes is crucial for developing therapeutic strategies.

[[Category:Biochemistry]]
[[Category:Molecular biology]]
[[Category:Genetics]]

{{Biochemistry-stub}}
{{Molecular-biology-stub}}
{{Genetics-stub}}
{{Medicine-stub}}

← Older revision		Revision as of 12:09, 18 February 2025
Line 24:		Line 24:
	{{Genetics-stub}}		{{Genetics-stub}}
	{{Medicine-stub}}		{{Medicine-stub}}
			<gallery>
			File:Summary_of_the_protein_biosynthesis_process.png\|Protein_biosynthesis
			File:Nucleotide_structure_within_a_polynucleotide_chain.png\|Protein_biosynthesis
			File:Directionality_of_DNA_molecule.png\|Protein_biosynthesis
			File:Process_of_DNA_transcription.png\|Protein_biosynthesis
			File:Post-transcriptional_modification_of_pre-mRNA.png\|Protein_biosynthesis
			File:Translation_-_cycle.png\|Protein_biosynthesis
			File:Protein_translation.gif\|Protein_biosynthesis
			File:Protein_folding_figure.png\|Protein_biosynthesis
			File:Post-translational_modification_by_cleavage.png\|Protein_biosynthesis
			File:Post-translational_modification_through_the_addition_of_small_chemical_groups.png\|Protein_biosynthesis
			File:Glycosylation_of_a_polypeptide.png\|Protein_biosynthesis
			File:Formation_of_disulphide_covalent_bonds.png\|Protein_biosynthesis
			</gallery>